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Autumn management of fingerlings takes know-how: these key technical points must be mastered

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1. Clear the pond in good time. After 2 to 3 months of rearing fingerlings, pond water quality generally has deteriorated, natural food organisms have decreased, and harmful gases such as hydrogen sulfide and pathogenic bacteria have increased. After the beginning of autumn, the fingerlings should be transferred to a pond that has been cleared and disinfected for rearing. Where there are difficulties in water supply and pond rotation, all the fingerlings can be transferred out for temporary holding, then the original pond should be disinfected with quicklime at 75 kg to 100 kg per 667 sq m, and water quality should be fertilized by conventional methods; after the efficacy of the lime has dissipated, transfer the fingerlings back to ensure purification of their living environment.

1. Clear the pond in good time. After 2 to 3 months of rearing fingerlings, pond water quality generally has deteriorated, natural food organisms have decreased, and harmful gases such as hydrogen sulfide and pathogenic bacteria have increased. After the beginning of autumn, the fingerlings should be transferred to a pond that has been cleared and disinfected for rearing. Where there are difficulties in water supply and pond rotation, all the fingerlings can be transferred out for temporary holding, then the original pond should be disinfected with quicklime at 75 kg to 100 kg per 667 sq m, and water quality should be fertilized by conventional methods; after the efficacy of the lime has dissipated, transfer the fingerlings back to ensure purification of their living environment.

2. Separate rearing and management. Fingerlings should be reasonably separated and reared according to different sizes, so that the fingerlings released back into the pond are of uniform size. Because large fingerlings have a big appetite and are strong at competing for food, if small fingerlings are stocked at the same time, the small fish will not get enough food and their body condition will decline. Fingerlings over 16 cm can be stocked in adult fish ponds for polyculture, while the smaller fingerlings need to be reared in dedicated ponds to avoid food competition and the extreme phenomenon of the strong getting stronger and the weak getting weaker.

3. Patrol the pond regularly. During fingerling rearing, persist in patrolling the pond every day to observe the fish's feeding and growth, pay attention to changes in water quality, change new water frequently, and add and change new water once a week. Also often clean the feeding area, promptly remove leftover residue and bait, and every half month splash 0.5 kg of bleaching powder dissolved in water around the feeding area; regularly feed medicated bait, preferably twice a month, each time for 3 consecutive days. If diseased or dead fish are found, promptly remove and bury them deeply, and at the same time carry out diagnosis and give drug treatment.

4. Reasonable thinning and stocking. Rearing larger-sized fingerlings in autumn is an important part of raising the overwintering survival rate of fingerlings. They should be reasonably thinned and stocked according to conditions such as water surface size and water depth to promote fingerling growth. For a pond 1.5 m deep, stock 4,000 to 6,000 fingerlings 7 cm to 8 cm long per 667 sq m; by the end of the year they can reach 13 cm to 17 cm in body length, which is of great significance for increasing farming returns.

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